The article
here.

With dozens of companies making untold numbers of carabiners these
days, it can be a real chore to navigate through countless different models to
choose the one that's right for your type of climbing. Wiregate vs. standard
gate. AutoLock vs. screwgate. Ultralight vs. heavy. What biners should I use on
my slimmed-down alpine rack as opposed to my daily sport cragging kit? As with
most pieces of climbing gear, there is a certain amount of inherent versatility,
but often certain products are better suited, and more often than not designed
specifically for certain applications. As with almost anything, it's always
prudent to select the right tool for the job. This month we'll attempt to
distill the basics of carabiner usage to help you figure out what's the right
choice for your type of climbing.